Battening apparatus in flat weaving machine

ABSTRACT

A flat weaving machine has a cloth support which is pivoted on a pivotal axis and a rotatable reed with a reed shaft which has an axis that is parallel to said pivotal axis, and a multiplicity of reed discs corotationally mounted on said reed shaft and having dogs adapted to extend between the warp threads and to beat up each filling thread against said fell. The reed shaft is operable to perform a succession of angular movements. Means are provided for pivotally moving said support away from said reed at the beginning of each of said angular movements of said reed shaft.

United States Patent 1 1 Filter Dec. 24, 1974 [54] BATTENING APPARATUS IN FLAT 3,191,633 6/1965 P161 139/11 WEAVING MACHINE 3,580,292 5/1971 Rambousek 139/291 R 3,727,648 4/1973 Essig 139/29] R Inventor: Walther Filter, Langenhagen, 3,766,950 10/1973 Vasek et al. 139/188 R f f' FOREIGN PATENTS 0R APPLICATIONS I [73] AsslgleesZ VFre'mgte Osterrelchlsche, 570,196 12 1957 Italy 139/188 R Ewen-"11d stahlwerke-Alpme 988,468 4/1965 0166181181111 1.39/188 R Montan Aktiengesellschaft, Vienna, 738,984 10/1932 France 139/291 R Austria; Establissement Wanderfield 1,408,893 7/1965 France 139/188 R & C0., Schaan, Liechtenstein Primary Examiner-James Kee Chi [22] i 1973 Attorney, Agent, or FirmKurt Kelman [21] Appl. No.: 387,721

' [57] ABSTRACT [30] Foreign Application Priority Data A flat weaving machine has a cloth support which is Aug. 18, 1972 Austria 7142 72 pivoted a Pivotal axis and a rotatable feed with a reed shaft which has an axis that is parallel to said piv- 52 U.S. c1. 139/291 R, 139/188 R Oral axis, and a multiplicity of reed discs Corotationally 51 Int. Cl D03d 49/00 mount! on Said reed Shaft and having dogs adapted [58] Field of Search... 139/188 R, 190, 191, 291 R, to extend between the p threads and to beat p 139/11 each filling thread against said fell. The reed shaft is operable to perform a succession of angular move- 5 References Cited ments. Means are provided for pivotally moving said UNITED STATES PATENTS support away from said reed at the beginning of each of said angular movements of said reed shaft 1,898,692 2/1933 Schm1ege 139/291 R 2,377,800 6/1945 Mascarhenhas 139/11 3 Claims, 2 Drawing Figures BATTENING APPARATUS IN FLAT WEAVING MACHINE This invention relates to an apparatus for beating up the filling thread in a flat weaving machine, which apparatus comprises an intermittently rotating reed roller which consists of a multiplicity of thin discs aligned on a common shaft and provided with dogs which extend between the warp threads and beat up the filling thread againstthe fell of the cloth guided by a support adjacent to the fell.

In a known apparatus of this kind (Austrian Pat. No. 45,679), the reed discs have a helical guide edge which extends around more than a complete circumference so that there is a threading slot between the leading and trailing ends of said guide edge. The shuttle must insert the filling thread intov this threading slot so that the subsequent rotation of the reed shaft results in a displacement of the filling thread along the guide edges of the reed discs and the filling thread is gradually advanced toward the fell of the cloth and is held between the upper and lower warp threads and the guide edges. It must be borne in mind, however, that the gradually increasing radius of the guide edge permits of a forcing of the filling thread against the fell only with a small force so that only a small number of filling threads per unit of length can be obtained. Besides, the filling thread is forced against the fell only until the ends of the guide edges have moved past the fell. Thereafter, the filling thread can separate from the fell before the filling thread is tied in by the next change of shed. For

. this reason, that known apparatus can be used only to make relatively loose woven fabrics. Besides, the reed shaft must be rotated through more than 360 between two changes of shed so that the operation can be carried out only at a relatively slow rate. Moreover, the filling thread can be inserted into the slot between the leading and trailing ends of the guide edge only if the reed shaft is exactly in a predetermined position during each pick because a projection carried by the shuttle must pull the filling thread through the threading slots of all reed discs.

In another known battening apparatus (Italian Pat. No. 570,196), the reed discs have dogs which protrude from the periphery of each disc and enter between the warp threads and beat up the filling thread against the fell. Whereas in that apparatus the sides of the protruding dogs beat up the filling thread firmly against the fell, the apparatus has the disadvantage that the dogs cannot retain the thread at the fell but must be moved past the fell on the underside thereof so that the filling thread which has been beaten up or the cloth may be damaged. To enable a movement of the dogs past the fell on the underside thereof, the support for the cloth must be comblike and the spaces between the teeth of the comb must be so wide that the dogs of the reed discs can pass therethrough. A pressure roll is provided, which forces the woven fabric against the sup- Y port on that the cloth cannot yield to the dogs and to ensure that the filling thread is beaten up against the fell. Because the cloth is forced against its support, on the other hand, the dogs cannot be moved in a simple manner past the fell on the underside thereof so that difficulties must be expected to arise in the operation of this known apparatus. Besides, the dogs extend between the warp threads in succession so that they may fail always to extend into the same spaces between warp threads and the appearance of the cloth may thus be adversely affected.

To ensure a hard beating up and consequently a large number of filling threads per unit of length, on the one hand, and to avoid damage to the fell by the dogs moving past the same, on the other hand, it has already been proposed (French Pat. No. 905,792) to pivot the dogs on the reed discs and to provide a camwheel. or the like for erecting each dog as it approaches the fell. When the filling thread has been beaten up, the dog disengages the camwheel and by means of a spring is swung away from the fell so that the rotation of the reed discs can be continued freely. Such reed is structurally expensive and has the serious disadvantage that the filling thread which has been beaten up may disengage from the fell so that a cloth having a uniform number of filling threads per unit of length cannot be produced. The erecting of the dogs by the camwheels involves again the risk that the dogs may enter different spaces between warp threads so that the resulting cloth is irregular in appearance. A wear of the camwheel will result in a change of the operating position of the dogs so that an undesired change of the beating-up force must be expected in the course of time.

In another known apparatus for beating up the filling thread (US. Pat. No. 696,263), the intermittently rotated reed comprises a multiplicity of star-shaped discs and is rotatably mounted in a bell-crank lever which is oscillated by a crank mechanism so that the reed is also periodically moved up and down. As a result of this oscillation of the reed, the reed discs rotate below the fell when they have beaten up the filling thread against the fell so that the star-shaped reed discs cannot damage the fell. On the other hand, that known apparatus also fails to beat up the filling thread with a strong force and to provide a uniform number of filling threads per unit of length because the protruding dogs of the starshaped discs are withdrawn from between the warp threads before the shed is changed to tie in the filling thread. Another disadvantage resides in the'expensive means for controlling the reed; nevertheless, it is not ensured that each reed discs always enters the same space between warp threads.

Finally, a loom is known (Austrian Pat. No. 78,724)

in which a rod which is capable of a limited angular movement extends under the warp throughout the width thereof close to the line in which the open reed enters the warp. By means of this rod, the warp can be slightly lifted and flattened shortly before the reed enters the warp. In this way, a correct, uniform entrance of the reed-into the warp is ensured. By said rod, the lower warp threads are raised into the plane of the upper warp threads so that the teeth of the open reed can always enter the same spaces between the warp threads. On the other hand, the same difficulties as in the other known apparatus arise when the filling thread is beaten up by the teeth of the reed because when the filling thread has been beaten up the rotating reed must be moved past the fell below the same. This is not readily possible.

It is an object of the invention to eliminate these disadvantages and to provide an apparatus which serves to beat up the filling thread in a flat weaving machine and by which a hard beating-up of the filling thread and the formation of a cloth having a uniform number of filling threads per unit of length are ensured with simple means.

step of the reed. The support can be pivotally moved in a simple manner. The pivotal movement of the support at the beginning of each angular step of the reed ensures also that the dogs continue to force the filling thread against the fell against which the thread has been beaten up and until the thread has been tied in and held in position as a result of the change of shed.

To enable the intermittent pivotal movement of the support in synchronism with the angular steps of the reed shaft to be carried out in a simple manner, it is a feature of the invention that a cam bar is provided, which is displaceable in parallel to the pivotal axis of the support and is preferably hydraulically operable, and followers are operatively associated with the support and bear on the cam bar. If the intermittent rotation of the reed is hydraulically controlled, the pivotal movement of the support can easily be synchronized with the rotation of the reed by the cam bar so that the several operations consisting of the change of shed, the pivotal movement of the support and thereafter the rotation of the reed shaft will be performed in the correct sequence and without a disturbance. The use of the cam bar also affords the advantage that even multi-part supports, particularly when wide cloth is woven, can be raised uniformly and quickly.

Because the support is pivotally moved, it may be provided adjacent to the fell in a desirable manner with a continuous straight edge, such as is conventional in machines having an oscillating reed. As a result, the manufacture of the support is much simplified and the filling thread is beaten up much more uniformly. Different from the known supports formed with teeth like a comb, the tendency of the support to become soiled is reduced and particles abraded from threads or the like can be more easily removed.

An embodiment of the invention is shown by way of example on the accompanying drawings, in which FIG. 1 is a transverse sectional view showing an apparatus for beating a filling thread into the fell of a fabric according to the invention and FIG. 2 is a sectional view taken on line "-11 of FIG.

The apparatus according to the invention for beating up the filling thread comprises an intermittently rotating reed roller which comprises a multiplicity of thin discs 2, aligned on a common shaft 1 and having dogs 3 which extend between the warp threads and beat the filling thread against the fell of the cloth. The cloth is supported adjacent to the fell by a support 4 mounted by pivoted levers 7 on breast beam 6 for rotation on a pivot 5 extending parallel to the reed shaft 1. A cam bar 8 is also mounted in the breast beam 6 and is displaceable parallel tothe pivot 5 to impart a pivotal movement to the support 4. Follower members 10 are provided with rollers 9 restingon the cam bar 8 and, upon a longitudinal displacement of the cam bar 8, force the followers against the pivoted levers 7'so that an upward pivotal movement is imparted to the levers 7 and the support 4. During the subsequent rotation of the reed, the dogs 30f the reed discs 2 can then be rotated freely past the support. To facilitate the displacement of the raised cam bar 8, the same is engaged by backing rollers 11 in alignment with followers 10. To reduce the noise, the pivoted levers 7 are provided with inserted resilient pads 12 engaged by the followers 10.

A stationary comb 13 is associated with the reed l, 2 and serves for an exact guidance of the warp threads. For this purpose, the teeth of the comb 13 extend approximately tangentially to the outer flight circle of the dogs 3 of the reed discs 2 so that, owing to the small distance between the comb and the reed each reed, disc 2 always enters the same space between warp threads.

To prevent a jumping of individual warp threads over the reed discs so as to disturb the warp arrangement, an additional comb 14 is provided, whose teeth extend between the reed discs approximately in the radial direction thereof.

When the filling thread has been inserted into the shed and placed between the combs 13 and 14 in front of dog 3 of the reed disc 2 (see position of FIG. 1), the cam bar 8 is operated to raise the support 4 and the cloth, and the reed shaft is rotated through an angle which corresponds to the angular spacing fo the dogs so that the filling thread is engaged and beaten up against the fell of the cloth by the corresponding dog of each reed disc. Support 4 is lowered when the corresponding dogs 3 have been rotated past the support so that the next following dogs can strongly beat up against the fell during the rotation of the reed. By means of the dogs 3, the reed discs 2 force the filling thread against the fell until the shed has been changed so that the filling thread has been tied in and fixed in position. Because the filling thread is retained against the fell, the filling thread cannot become loose before it has been tied in. For this reason a cloth having a particularly large number of filling threads per unit of length can be woven. When the shed has been changed, a new filling thread is inserted, thesupport 4 is again raised for a short time and the discs 2 are caused to perform another angular step. When the cloth is raised by the support 4, the dogs 3 are withdrawn from between the warp threads at the fell and are moved past the fell belowthe same. The support 4 may be provided in a very simple manner with a continuousstraight edge 16, which does not only promote a more uniform beatingup of the filling thread against the fell of the cloth but also facilitates the removal of any dust which has been abraded from the threads.

What is claimed is:

1. In a flat weaving machine operable to insert successive filling threads between spaced apart warp threads and to beat up the filling threads so as to form a cloth having a fell, the combination of l. a support for supporting the cloth adjacent the fell,

2. a horizontally extending pivot axis mounting the support for a pivotal movement between positions close to, and away from, a reed,

3. a reed comprising a. a reed shaft having an axisextending parallel to the pivot axis" of the support, b. a multiplicity of reed discs corotationally mounted on the reed shaft and having dogs 6 adapted to extend between the warp threads and 2. The combination set forth in claim 1, in which said to beat successive ones of the filling threads means for pivotally moving said support comprise agamst the fell and a cam bar which is displaceable parallel to said pivc. the reed shaft being operable to perform a succession of angular movements for beating the 5 successive filling threads against the fell, and followers beanng on Sald cam bar and operatwely as 4. means pivotally moving the support into the posi- Soclated f Support.

tion away f the reed and out of the path of he 3. The combination set forth In claim 1, 1n WhlCh said dogs during the angular movements only at the be- Support has a continuous Straight edge adjacent Said ginning of each of the angular movements of the 10 fellreed shaft.

otal axis and 

1. In a flat weaving machine operable to insert successive filling threads between spaced apart warp threads and to beat up the filling threads so as to form a cloth having a fell, the combination of
 1. a support for supporting the cloth adjacent the fell,
 2. a horizontally extending pivot axis mounting the support for a pivotal movement between positions close to, and away from, a reed,
 3. a reed comprising a. a reed shaft having an axis extending parallel to the pivot axis of the support, b. a multiplicity of reed discs corotationally mounted on the reed shaft and having dogs adapted to extend between the warp threads and to beat successive ones of the filling threads against the fell, and c. the reed shaft being operable to perform a succession of angular movements for beating the successive filling threads against the fell, and
 4. means pivotally moving the support into the position away from the reed and out of the path of the dogs during the angular movements only at the beginning of each of the angular movements of the reed shaft.
 2. a horizontally extending pivot axis mounting the support for a pivotal movement between positions close to, and away from, a reed,
 2. The combination set forth in claim 1, in which said means for pivotally moving said support comprise a cam bar which is displaceable parallel to said pivotal axis and followers bearing on said cam bar and operatively associated with said support.
 3. The combination set fOrth in claim 1, in which said support has a continuous straight edge adjacent said fell.
 3. a reed comprising a. a reed shaft having an axis extending parallel to the pivot axis of the support, b. a multiplicity of reed discs corotationally mounted on the reed shaft and having dogs adapted to extend between the warp threads and to beat successive ones of the filling threads against the fell, and c. the reed shaft being operable to perform a succession of angular movements for beating the successive filling threads against the fell, and
 4. means pivotally moving the support into the position away from the reed and out of the path of the dogs during the angular movements only at the beginning of each of the angular movements of the reed shaft. 